|
Problem IC77326
|
Status: Closed |
MERGE QUERY REWRITE RULE ENHANCEMENT |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
This enhancement changes MERGE statement with only MATCHED
condition. When source table rows are updated and/or inserted
into target table via MERGE statement, DB2 used to do "<source
table> left outer join <target table>" and it can be observed in
the explain plan. If the MERGE statement has only one matching
condition and that condition is "MATCHED", this enhancement will
change that join to "<source table> inner join <target table>". |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All *
****************************************************************
* PROBLEM DESCRIPTION: *
* This enhancement changes MERGE statement with only MATCHED *
* condition. When source table rows are updated and/or *
* inserted *
* into target table via MERGE statement, DB2 used to do *
* "<source table> left outer join <target table>" and it can *
* be observed in *
* the explain plan. If the MERGE statement has only one *
* matching condition and that condition is "MATCHED", this *
* enhancement will *
* change that join to "<source table> inner join <target *
* table>". *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 V9.7 FP6 *
**************************************************************** |
| Local Fix: |
n/a |
| available fix packs: |
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
First fixed in DB2 9.7 FP 6 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 05.07.2011
13.11.2012
13.11.2012 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP6
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.6
|
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